Is the Trinity a piece of celestial algebra that really makes no difference to Christians, or a life-giving mystery that teaches us something vital about God and ourselves? This doctrine has taken its shape and focus over many centuries, and this textbook aims to retrieve key insights that have emerged at different times and to root them in their authors' life experience. It also explores contemporary re-expressions and ramifications of this teaching. It seeks a fruitful integration of various approaches to this mystery, notably to the psychological (intra-personal) and social...